WA Prison Officers' Union secretary John Welch said two prison officers were injured on Monday at Casuarina Prison while moving an inmate between cells.

Mr Welch said the inmate had been involved in a number of assaults in the past few weeks.

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The matter has been referred to WA Police for investigation.

Although the injuries sustained by the officers in the latest attack were not believed to be serious, it brings the number of officers injured by this prisoner to eight since the beginning of the month.

Mr Welch also said one officer at Roebourne Regional Prison sprained his shoulder and another damaged his knees in a fracas with a prisoner on Monday.

A spokesman for the Department of Corrective Services confirmed an incident took place but said the officers received only grazes.

It is understood the officers came into contact with blood from the offender and now face a three-month wait to see if they have contracted a blood-borne virus.

On Wednesday at Acacia Prison, an officer is understood to have lost consciousness after receiving a number of blows to the head in an attack by a prisoner.

Mr Welch said the officer was taken to hospital in an ambulance and another also received injuries in the scuffle.

The Department of Corrective Services spokesman confirmed one officer was injured in this incident but was allowed to go home after being assessed at Swan District Hospital.

He said these incidents were examples of why prison workers deserved an increase in wages.

Prison officers are campaigning for better pay and conditions for officers, increased staffing levels at prisons and new prison facilities to deal with overcrowding.

The spokesman for the Department of Corrective Services said the nature of the prisoners incarcerated in WA prisons made assaults inevitable.

He said while officers were highly trained in dealing with prisoners and conflict situations, the department also aimed to mitigate violence through a number of ways including risk assessments and management of prisoner placement.